| Year | Count |
|---|---|
| 1914 | 6 |
| 1915 | 5 |
| 1916 | 16 |
| 1917 | 16 |
| 1918 | 7 |
| 1919 | 7 |
| 1920 | 8 |
| 1921 | 5 |
| 1922 | 17 |
| 1923 | 8 |
| 1925 | 8 |
| 1926 | 8 |
| 1927 | 7 |
| 1928 | 8 |
| 1930 | 7 |
| 1931 | 24 |
| 1932 | 20 |
| 1933 | 27 |
| 1934 | 9 |
| 1935 | 36 |
| 1936 | 38 |
| 1937 | 24 |
| 1938 | 40 |
| 1939 | 28 |
| 1940 | 47 |
| 1941 | 67 |
| 1942 | 39 |
| 1943 | 74 |
| 1944 | 43 |
| 1945 | 14 |
| 1946 | 59 |
| 1947 | 38 |
| 1948 | 40 |
| 1949 | 48 |
| 1950 | 39 |
| 1951 | 48 |
| 1952 | 32 |
| 1953 | 47 |
| 1954 | 44 |
| 1955 | 25 |
| 1956 | 19 |
| 1957 | 32 |
| 1958 | 40 |
| 1959 | 17 |
| 1960 | 27 |
| 1961 | 28 |
| 1962 | 9 |
| 1963 | 5 |
| 1964 | 7 |
| 1965 | 10 |
| 1966 | 7 |
| 1969 | 5 |
| 1970 | 5 |
| 1971 | 5 |
| 1973 | 5 |
| 1974 | 6 |